Peters



(No Model.) I

J. R. ADAMS 8; D. ROBERTSON. Detachable Lip for Angers.

.No. 236,401. Paten't ed Jan. 11,1881.

UNITED STATES PATENT FFICE.

DETACHABLE LIP FOR AUGERS.

SPECIFICATION forming part of Letters Patent No. 236,401, dated January11, 1881.

Application filed November 5, 1880.

To all whom it may concern Be it known that we, JoHN It. ADAMS andDANIEL ROBERTSON, both of the city of Oakland, in the county of Alamedaand State of California, have made and invented a new and useful[mprovementin Detachable Lips for Augers; and we do hereby declare thatthe following is a full. clear, and exact description of our saidinvention and the manner in which we apply the same, reference being hadto the accompanying drawings.

This invention has relation to certain new and useful improvements inthat. class of angers or other similar boring-tools provided with aseparable cutting-point attached to the end of the tool in such mannerthat when worn out or broken it can be removed and replaced by a newpoint, the object thereof being to add to the durability of the tool byrendering the stock or body serviceable for a much longer time.

The invention consists in the peculiar manner of attaching thecutting-point to the end of the anger or other tool, as illustrated inthe drawings, and hereinafter described.

In the accompanying drawings, Figure 1 is a view of an auger with ourimproved detachable lip applied to it. Figs. 2 and 3 are front views ofthese parts separated. Figs. 4 and 5 are top views of Figs. 2 and 3respectively. Fig. 6 is a detail view from the rear end of thecutting-lip. Fig. 7 is a front view of the end of the auger andcutting-lip.

In applying our invention to an anger we make the point or cutting-edgeon a separate piece, A, and this piece we insert and fix in place on theend of the shank, so that the cutting-edge a shall form the propercontinuation of the first spiral and have the requisite upward andforward curve. The remaining part of the removable piece A, on which isformed the cutting-lip a, has its sides beveled or made of a wedgeshape, in order to fasten it in place upon the end of the tool. For thispurpose we make a slot or groove diametrically across (No model.)

the end of the tool, of a form corresponding to the end of the part A,and in this slot B we insert and fasten the removable piece A. One sideof this slot B extends entirely across the end of the auger, so that theback of the part a is received and fits against this side b as a solidshoulder. The cutting point or lip is thus held firmly and securely tothe end ot'the auger, and is capable of performing itswork as well as asolid cutting-lip, or one formed on the end of the spiral.

As the means of retaining this removable point in place when inserted inthe slot B, we upset the end of the piece A by forcing down a lip, c,from the metal, and turning this lip down into a small cavity ordepression, (1, provided on the outer edge of the first spiral, so thatthis edge or face shall be preserved smooth and fiush with the rest ofthe shank. This separable point A will have also the center gimlet orscrew point fixed upon it, when such is required for the tool, and wheneither the cutting-lip a or this screw-point becomes damaged the piece Acan be withdrawn from the tool and anew pointinserted. By this means theshank or body of the tool is retained for use and rendered of servicefor along time.

Having thus fully described our invention, what we claim, and desire tosecure by Letters Patent, is-- An auger or other similar boring-toolhaving the dovetail slot B diametrically across the end thereof and thecavity or depression 0?, in combination with the dovetail piece A, withpoint or cutting-edge a, and lip c, the piece A being secured within theslot B by forcing down the lip into the depression, so that the outeredge or face shall be preserved smooth and flush with the rest of theshank, substantially as and for the purpose set forth.

J. 1t. ADAMS. [L. s. 1). nocmrrson. [L.S.

Witnesses:

A. U. MILLs, W. T. ROWLANDS.

